Pialf to theodore s



(No Model.)

B. D. STEVENS.

PLANING MACHINE.

Patented Jgne 18, 1889.

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m N mi@ UNITED STATES PATENT OFFICE.

BENQIAIWIIN D. STEVENS, OF BURLINGTON, VERMONT, ASSIGNOR OF ONE- IIALFTO THEODORE S. PECK, OF SAME PLACE.

PLANlNG-MACHINE.

SPECIFICATION forming part of Letters Patent N0. 405,280, dated June 18,1889.

Application filed March `25, 1886. Serial No. 196,445. (No model.)

To all whom t may concern.-

Be it known that I, BENJAMIN D. STEVENS, of Burlington, in the State ofVermont, have invented a certain new and useful Improvement inFlaming-Machines for Planing Blind- Slat Stock and other Thin Pieces ofNVood, of which the following is a specification.

The object I have in view is to insure vthe smooth planing of thinstrips or pieces of wood combine a power-driven presser and feed roll,which bears upon the material from the side opposite that which is beingplaned at about the point where the plane-bit makes its cut, this rollbeing located above the mate rial, while the plane itself is below or onthe under side of the material. The roll bears upon the thin strip ofwood with yielding pressure and forces it down upon the platen tightlyat the point'where the planing operation takes place. It also acts tofeed along the material, being power-driven and revolving at the sameperipheral speed with the other feed-rolls; The plane-stock itself ismounted in transverse ways in the frame of the machine, so that it canbe inserted into pla-ce or withdrawn from the side of the machine, andwhen it is in place its face forms the platen or bed upon which the woodis pressed and held down by the intermediate pressure and feed roll.

In the drawings, Figure l is a longitudinal vertical section of so muchof a planing-machine as needed for the purpose of illustrating myimprovements. Fig. 2 is a plan. of the same. p

A is the frame of the machine.

B is the platen or bed-plate.

C is the front feed-roll, and C its 'fellowl roll, which works againstroll O through an opening in the bed-plate.

D D are the rear feed-rolls, arranged similarly to the front pair. RollsC D are power- '.I at the rear end of the machine.

G 1s power-driven and derives its movement driven and are supported inspring-bearings, whereby they are pressed toward their fellow rolls,which latter revolve by frictional contact merely. On the shaft of rollC are the fast and loose pulleys w y for the belt by which power iscommunicated to the machine. Roll D is driven from C by pulleys andbelting, as indicated in Fig. 2. The rolls are to the front and rear,respectively, of the point where the planing takes place, and thedirection of feed is indicated by the arrow. The strip of thin wood tobe operated on is represented at m. Thus far there is nothing novel inthe machine.

The plane-stock is seen at E. It is to be inserted in place from theside of the machine in position to cause the plane-bit F to act upon thematerial m from below, the upper face of said stock forming the bed uponwhich that portion of the wood in the immediate vicinity 0f theplane-bit rests. To this end transverse ways a are formed in thebed-plate ata rpoint intermediate between the two pairs of feed-rolls,and the bed-plate is cut away between these ways. The side edges of thes1 ook E are formed to iit between 'and slide in these ways, and thestock itself is so constructed that when inserted into place its upperface will project up into the opening in the bed-plate B and will beflush with the face of the latter. Y

Immediately above the point where the plane-bit is located is placed athird and intermediate presser and feed roll G, for the purposeindicated in the opening portion of this specification. Said roll ispower-driven and bearsA upon the material with yielding pressure, forwhich purpose it may be supported in spring or elasticbearings, likethose of the rolls C D, or may be otherwise arranged in various knownways so as to exert the requisite yielding pressure. I prefer, however,the arrangement shown in the drawings, which is employed with a view topermit the roll to be swung back from over the plane stock and bitwhenever desired. The shaft G of the roll is j ournaled in twobracket-arms II, hung upon a cross-rod I, which is mounted in stands Theshaft ICO from a pulley e upon it, which is belted to a pulley on across-shaft b, which in turn is driven from the shaft of roll D, asindicated in the drawings. This is one ofthe many ways in which motionmay be imparted to the roll G. The bracket arms or frame I-I can be helddown by a spring or springs, as indicated by dotted lines in Fig. 1,01*by weights. The roll G is of course geared or belted so as to move atthe same peripheral speed as the other rolls C D. By this means I obtaina positive feeding' action at the pointwhere the resistance to theforward movement of material takes place during the planing operation,and at the same time I am enabled to press the material down flat uponthe bed with all the power desired at the point where the planing takesplace, thus insuring smooth planing notwithstanding accidentalirregularities in the surface of the material.

Having described my improvements and the best way now known to me ofcarrying the same into effect, what I claim herein as new and of my owninvention is as follows:

1. The combination of the bed-plate, the plane-stock mounted therein,the front and rear feed-rolls, and the interim-chate powerdriven presserand feed roll arranged to bear from above with yielding pressure uponthe material at about the point Where the planebit makes its cut,substantially as and for the purposes hereinbefore set forth.

2. The combination of the bed-plate, the plane-stock mounted in anopening therein so that its upper face shall be iiush with that of thebed-plate, and the power-driven yielding` presser and feed roll G,arranged to bear from above upon the face of the plane-stock, as and forthe purposes hereinbcfore set forth.

The bed-plate formed with an opening and with transverse ways forreception of the plane-stock and the removable plane-stock mountedtherein, in combination with the front and rear feed-rolls and theintermediate power-driven yielding presser and feed roll G, these partsbeing constructed and arranged together for joint operation,substantially as hereinbeforc sct forth.

In testimony whereof I have hereunto set my hand this 22d day of March,1880.

BENJD'L D. STEVENS.

lVi tn esses:

EWELL A. Dick, MARVIN A. CUs'rIs.

